John Deere ET-3103-J - Manual (Page 22)

22 Cordless Impact Wrench Operator's Manual
Maintenance and Inspection
CAUTION: PULL OUT BATTERY BEFORE DOING ANY INSPECTION OR
MAINTENANCE.
1. Checking the condition of the socket:
A worn or deformed hex or a square-holed socket will not give an adequate tightness
to the fitting between the nut or anvil, consequently resulting in loss of tightening
torque. Pay attention to wear of a socket holes periodically, and replace with a new
one if needed.
2. Check the Screws:
Loose screws are dangerous. Regularly inspect them and make sure they are tight.
CAUTION: USING THIS POWER TOOL WITH LOOSENED SCREWS IS
EXTREMELY DANGEROUS.
3. Maintenance of the motor:
The motor unit winding is the very “heart” of the power
tool.
Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes (Fig. 19):
The motor employs carbon brushes which are
consumable parts. Since and excessively worn carbon
brush can result in motor trouble, replace the carbon
brush with new ones when it becomes worn to or near
the “wear limit”. In addition, always keep carbon
brushes clean and ensure that they slide freely within
the brush holders.
NOTE: When replacing the carbon brush with a new
one, be sure to use the JOHN DEERE Carbon
Brush Code No. 999054.
5. Replacing carbon brushes:
Take out the carbon brush by first removing the brush
cap and then hooking the protrusion of the carbon
brush with a flat head screw driver, etc., as shown in
Fig. 21.
When installing the carbon brush, choose the direction
so that the nail of the carbon brush agrees with the
contact portion outside the brush tube. Then push it in
with a finger as illustrated in Fig. 22. Lastly, install the
brush cap.
MAINTENANCE AND INSPECTION:
(Fig. 19)
(Fig. 20)
(Fig. 21)
(Fig. 22)